Kroger Prepaid Phone Refill Cards: AT&T, Cricket, Tracfone, Net10, Total Wireless, Simple Mobile, T-Mobile 20% off (Email Delivery)

Good through April 23, 2019. They do charge 911 fee and sales tax on applicable cards.
Limit 3 of the same dollar denomination per customer.
https://giftcards.kroger.com/promotions